At first, the cause of the deaths was a mystery, and causes such as terrorism were suspected.

The cause of death was suspected to be Heart failure.

Otherwise, if a man does not obtain an erection in either state, a physiological cause is usually suspected.

The probable cause for the collapse has been suspected as under designing of the building.

The cause of the fire is under investigation, but is suspected to be construction work.

Because 8 out of 10 patients had a positive family history of dementia in the original study, a genetic cause was suspected.

Probable cause of the accident was suspected to have been excessive speeding.

These cases are referred as cryptogenic if a cause is suspected, but unknown.

In the early 1990s the building burned down, and the cause of the fire was suspected to be arson.

The building burned down during the mid-1990s and the cause was suspected to be arson, however, the perpetrators were never brought in.